Workaround for PowerVR clear issue.

src/gpu/gl/GrGpuGL.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpuGL_DEFINED
 #define GrGpuGL_DEFINED
 
@@ skipping 116 matching lines @@
     virtual GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) SK_OVERRIDE;
     virtual GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&) SK_OVERRIDE;
     virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&) SK_OVERRIDE;
     virtual bool createStencilBufferForRenderTarget(GrRenderTarget* rt,
                                                     int width,
                                                     int height) SK_OVERRIDE;
     virtual bool attachStencilBufferToRenderTarget(
         GrStencilBuffer* sb,
         GrRenderTarget* rt) SK_OVERRIDE;
 
-    virtual void onClear(GrRenderTarget*, const SkIRect* rect, GrColor color,
-                         bool canIgnoreRect) SK_OVERRIDE;
+    virtual void onGpuClear(GrRenderTarget*, const SkIRect* rect, GrColor color,
+                            bool canIgnoreRect) SK_OVERRIDE;
 
     virtual void onClearStencilClip(GrRenderTarget*,
                                     const SkIRect& rect,
                                     bool insideClip) SK_OVERRIDE;
 
     virtual bool onReadPixels(GrRenderTarget* target,
                               int left, int top,
                               int width, int height,
                               GrPixelConfig,
                               void* buffer,
@@ skipping 303 matching lines @@
 
     // we record what stencil format worked last time to hopefully exit early
     // from our loop that tries stencil formats and calls check fb status.
     int fLastSuccessfulStencilFmtIdx;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif